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Provisions (Tables)
12 Months Ended
Dec. 31, 2019
TextBlock [abstract]  
Summary of Provisions
The Company’s current provisions were provisions for sales returns and allowances.
 
   
Sales Returns

and Allowances
 
   
NT$
(In Millions)
 
Year Ended December 31, 201
7
  
Balance, beginning of year
  $18,037.8 
Provision
   44,833.6 
Payment
   (48,884.7
Effect of exchange rate changes
   (24.9
  
 
 
 
Balance, end of year
  $13,961.8